15x^2+10x-3=0

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Solution for 15x^2+10x-3=0 equation:


Simplifying
15x2 + 10x + -3 = 0

Reorder the terms:
-3 + 10x + 15x2 = 0

Solving
-3 + 10x + 15x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
15 the coefficient of the squared term: 

Divide each side by '15'.
-0.2 + 0.6666666667x + x2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + 0.6666666667x + 0.2 + x2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + 0.6666666667x + x2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + 0.6666666667x + x2 = 0 + 0.2
0.6666666667x + x2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
0.6666666667x + x2 = 0.2

The x term is 0.6666666667x.  Take half its coefficient (0.3333333334).
Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.
0.6666666667x + 0.1111111112 + x2 = 0.2 + 0.1111111112

Reorder the terms:
0.1111111112 + 0.6666666667x + x2 = 0.2 + 0.1111111112

Combine like terms: 0.2 + 0.1111111112 = 0.3111111112
0.1111111112 + 0.6666666667x + x2 = 0.3111111112

Factor a perfect square on the left side:
(x + 0.3333333334)(x + 0.3333333334) = 0.3111111112

Calculate the square root of the right side: 0.557773351

Break this problem into two subproblems by setting 
(x + 0.3333333334) equal to 0.557773351 and -0.557773351.

Subproblem 1

x + 0.3333333334 = 0.557773351 Simplifying x + 0.3333333334 = 0.557773351 Reorder the terms: 0.3333333334 + x = 0.557773351 Solving 0.3333333334 + x = 0.557773351 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + x = 0.557773351 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = 0.557773351 + -0.3333333334 x = 0.557773351 + -0.3333333334 Combine like terms: 0.557773351 + -0.3333333334 = 0.2244400176 x = 0.2244400176 Simplifying x = 0.2244400176

Subproblem 2

x + 0.3333333334 = -0.557773351 Simplifying x + 0.3333333334 = -0.557773351 Reorder the terms: 0.3333333334 + x = -0.557773351 Solving 0.3333333334 + x = -0.557773351 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + x = -0.557773351 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = -0.557773351 + -0.3333333334 x = -0.557773351 + -0.3333333334 Combine like terms: -0.557773351 + -0.3333333334 = -0.8911066844 x = -0.8911066844 Simplifying x = -0.8911066844

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.2244400176, -0.8911066844}

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